The requirements for the achievement are pretty straightforward, but I figured it should be mentioned that this counts all modes of gameplay, including CQC matches. As of posting this I have almost 200 kills to my name, but I've only shot down around 15 or so in the actual game, so don't worry if you're not running a combat-oriented ship in the main game, you can still get this when/if you decide to grind out the CQC matches.